[Intel-gfx] [PATCH v5 05/22] drm/i915/dg1: Wait for pcode/uncore handshake at startup
Lucas De Marchi
lucas.demarchi at intel.com
Fri Jul 24 21:39:01 UTC 2020
From: Matt Roper <matthew.d.roper at intel.com>
DG1 does some additional pcode/uncore handshaking at
boot time; this handshaking must complete before various other pcode
commands are effective and before general work is submitted to the GPU.
We need to poll a new pcode mailbox during startup until it reports that
this handshaking is complete.
The bspec doesn't give guidance on how long we may need to wait for this
handshaking to complete. For now, let's just set a really long timeout;
if we still don't get a completion status by the end of that timeout,
we'll just continue on and hope for the best.
Bspec: 52065
Cc: Clinton Taylor <Clinton.A.Taylor at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
drivers/gpu/drm/i915/i915_drv.c | 3 +++
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_sideband.c | 15 +++++++++++++++
drivers/gpu/drm/i915/intel_sideband.h | 2 ++
4 files changed, 23 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 5fd5af4bc855..5473bfe9126c 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -85,6 +85,7 @@
#include "intel_gvt.h"
#include "intel_memory_region.h"
#include "intel_pm.h"
+#include "intel_sideband.h"
#include "vlv_suspend.h"
static struct drm_driver driver;
@@ -737,6 +738,8 @@ static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
*/
intel_dram_detect(dev_priv);
+ intel_pcode_init(dev_priv);
+
intel_bw_init_hw(dev_priv);
return 0;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index a0d31f3bf634..3767b32127da 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9245,6 +9245,9 @@ enum {
#define GEN9_SAGV_DISABLE 0x0
#define GEN9_SAGV_IS_DISABLED 0x1
#define GEN9_SAGV_ENABLE 0x3
+#define DG1_PCODE_STATUS 0x7E
+#define DG1_CHECK_UNCORE_INIT_STATUS 0x0
+#define DG1_UNCORE_INIT_COMPLETE 0x1
#define GEN12_PCODE_READ_SAGV_BLOCK_TIME_US 0x23
#define GEN6_PCODE_DATA _MMIO(0x138128)
#define GEN6_PCODE_FREQ_IA_RATIO_SHIFT 8
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
index 916ccd1c0e96..8b093525240d 100644
--- a/drivers/gpu/drm/i915/intel_sideband.c
+++ b/drivers/gpu/drm/i915/intel_sideband.c
@@ -543,3 +543,18 @@ int skl_pcode_request(struct drm_i915_private *i915, u32 mbox, u32 request,
return ret ? ret : status;
#undef COND
}
+
+void intel_pcode_init(struct drm_i915_private *i915)
+{
+ int ret;
+
+ if (!IS_DGFX(i915))
+ return;
+
+ ret = skl_pcode_request(i915, DG1_PCODE_STATUS,
+ DG1_CHECK_UNCORE_INIT_STATUS,
+ DG1_UNCORE_INIT_COMPLETE,
+ DG1_UNCORE_INIT_COMPLETE, 50);
+ if (ret)
+ drm_err(&i915->drm, "Pcode did not report uncore initialization completion!\n");
+}
diff --git a/drivers/gpu/drm/i915/intel_sideband.h b/drivers/gpu/drm/i915/intel_sideband.h
index 7fb95745a444..094c7b19c5d4 100644
--- a/drivers/gpu/drm/i915/intel_sideband.h
+++ b/drivers/gpu/drm/i915/intel_sideband.h
@@ -138,4 +138,6 @@ int sandybridge_pcode_write_timeout(struct drm_i915_private *i915, u32 mbox,
int skl_pcode_request(struct drm_i915_private *i915, u32 mbox, u32 request,
u32 reply_mask, u32 reply, int timeout_base_ms);
+void intel_pcode_init(struct drm_i915_private *i915);
+
#endif /* _INTEL_SIDEBAND_H */
--
2.26.2
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